Grant Duff, S. A noble combat, 1988 CIP t.p. (Klemens von Klemperer) data sheet (L. Clark Seelye Prof. of history, Smith College, Northampton, Mass.)
LC data base, 6-19-87 (hdg.: Von Klemperer, Klemens, 1916-)
New York times WWW site, Jan. 7, 2013 (Klemens von Klemperer; b. Klemens Wilhelm von Klemperer, Nov. 2, 1916, Berlin; d. Dec. 23 [2012], Easthampton, Mass., aged 96; refugee from Nazi Germany who wrote what is widely considered the seminal history of the movement among the country's conservative elite to overthrow Hitler)